You can’t just lob “The urban legend that DNS-based load balancing depends on TTLs (it doesn’t)“ without an explanation! If I have an endpoint go away I want people to stop using it quickly. (Or are you referring to the case where all the endpoints are up?)
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DNS-based load balancing relies on multi-value DNS records. If an endpoint fails the client can try the next value in the record without having to do another query. As long as the clients are quick at doing this, having dead endpoints in the record is not much of a problem.
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DynDNS might be another use case for short TTLs (and one which I'd consider "legitimate"). Also, some zones are 100% irrelevant to human users and are only used for automation purposes ("_acme-challenge" records/zones come to mind).
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If you can't afford a static IP, surely your service isn't so critical that 30 minutes of downtime would be a huge problem?
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having been in IT back when the TTL standard was 3days. I would rather have high DNS trafic then have to explain a multi day outage due to DNS.
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There's a world of difference between 'not wanting 3 days' and 'going down to less than a minute'. One is reasonable; the other is not.
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Alternate take: Bandwidth increases/latency reduction has made it so that DNS traffic efficiency is less important than developer angst. How long is the DNS lookup compared to the page load time? Can't see that this is affecting the end user experience much.
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This blows my mind that anybody would do such short times in production. It's one thing to have a low (<15min) TTL for testing DNS changes. But once they're shown to be working, anything less than an hour is pretty crazy (I'd posit that even <6hr is still pretty questionable).
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Isn't this a technique for an attack? The name escapes me, but it's a way for an attacker to run exploits on internal assets like home routers.
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I found it... DNS rebinding attack.https://danielmiessler.com/blog/dns-rebinding-explained/ …
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